Commit 96d01610 authored by Sam bobroff's avatar Sam bobroff Committed by Benjamin Herrenschmidt
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powerpc: Correct DSCR during TM context switch

Correct the DSCR SPR becoming temporarily corrupted if a task is
context switched during a transaction.

The problem occurs while suspending the task and is caused by saving
the DSCR to thread.dscr after it has already been set to the CPU's
default value:

__switch_to() calls __switch_to_tm()
	which calls tm_reclaim_task()
	which calls tm_reclaim_thread()
	which calls tm_reclaim()
		where the DSCR is set to the CPU's default
__switch_to() calls _switch()
		where thread.dscr is set to the DSCR

When the task is resumed, it's transaction will be doomed (as usual)
and the DSCR SPR will be corrupted, although the checkpointed value
will be correct. Therefore the DSCR will be immediately corrected by
the transaction aborting, unless it has been suspended. In that case
the incorrect value can be seen by the task until it resumes the

The fix is to treat the DSCR similarly to the TAR and save it early
in __switch_to().

A program exposing the problem is added to the kernel self tests as:
Signed-off-by: default avatarSam Bobroff <>
CC: <> [v3.10+]
Signed-off-by: default avatarBenjamin Herrenschmidt <>
parent fb5a5157
......@@ -16,13 +16,15 @@ struct thread_struct;
extern struct task_struct *_switch(struct thread_struct *prev,
struct thread_struct *next);
static inline void save_tar(struct thread_struct *prev)
static inline void save_early_sprs(struct thread_struct *prev)
if (cpu_has_feature(CPU_FTR_ARCH_207S))
prev->tar = mfspr(SPRN_TAR);
if (cpu_has_feature(CPU_FTR_DSCR))
prev->dscr = mfspr(SPRN_DSCR);
static inline void save_tar(struct thread_struct *prev) {}
static inline void save_early_sprs(struct thread_struct *prev) {}
extern void enable_kernel_fp(void);
......@@ -428,12 +428,6 @@ BEGIN_FTR_SECTION
std r24,THREAD_VRSAVE(r3)
#endif /* CONFIG_ALTIVEC */
#ifdef CONFIG_PPC64
mfspr r25,SPRN_DSCR
std r25,THREAD_DSCR(r3)
and. r0,r0,r22
beq+ 1f
andc r22,r22,r0
......@@ -755,15 +755,15 @@ struct task_struct *__switch_to(struct task_struct *prev,
/* Back up the TAR across context switches.
/* Back up the TAR and DSCR across context switches.
* Note that the TAR is not available for use in the kernel. (To
* provide this, the TAR should be backed up/restored on exception
* entry/exit instead, and be in pt_regs. FIXME, this should be in
* pt_regs anyway (for debug).)
* Save the TAR here before we do treclaim/trecheckpoint as these
* will change the TAR.
* Save the TAR and DSCR here before we do treclaim/trecheckpoint as
* these will change them.
......@@ -13,7 +13,7 @@ CFLAGS := -Wall -O2 -flto -Wall -Werror -DGIT_VERSION='"$(GIT_VERSION)"' -I$(CUR
export CC CFLAGS
TARGETS = pmu copyloops mm
TARGETS = pmu copyloops mm tm
PROGS := tm-resched-dscr
all: $(PROGS)
run_tests: all
@-for PROG in $(PROGS); do \
./$$PROG; \
rm -f $(PROGS) *.o
.PHONY: all run_tests clean
/* Test context switching to see if the DSCR SPR is correctly preserved
* when within a transaction.
* Note: We assume that the DSCR has been left at the default value (0)
* for all CPUs.
* Method:
* Set a value into the DSCR.
* Start a transaction, and suspend it (*).
* Hard loop checking to see if the transaction has become doomed.
* Now that we *may* have been preempted, record the DSCR and TEXASR SPRS.
* If the abort was because of a context switch, check the DSCR value.
* Otherwise, try again.
* (*) If the transaction is not suspended we can't see the problem because
* the transaction abort handler will restore the DSCR to it's checkpointed
* value before we regain control.
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <asm/tm.h>
#define TBEGIN ".long 0x7C00051D ;"
#define TEND ".long 0x7C00055D ;"
#define TCHECK ".long 0x7C00059C ;"
#define TSUSPEND ".long 0x7C0005DD ;"
#define TRESUME ".long 0x7C2005DD ;"
#define SPRN_TEXASR 0x82
#define SPRN_DSCR 0x03
int main(void) {
uint64_t rv, dscr1 = 1, dscr2, texasr;
printf("Check DSCR TM context switch: ");
for (;;) {
rv = 1;
asm __volatile__ (
/* set a known value into the DSCR */
"ld 3, %[dscr1];"
"mtspr %[sprn_dscr], 3;"
/* start and suspend a transaction */
"beq 1f;"
/* hard loop until the transaction becomes doomed */
"2: ;"
"bc 4, 0, 2b;"
/* record DSCR and TEXASR */
"mfspr 3, %[sprn_dscr];"
"std 3, %[dscr2];"
"mfspr 3, %[sprn_texasr];"
"std 3, %[texasr];"
"li %[rv], 0;"
"1: ;"
: [rv]"=r"(rv), [dscr2]"=m"(dscr2), [texasr]"=m"(texasr)
: [dscr1]"m"(dscr1)
, [sprn_dscr]"i"(SPRN_DSCR), [sprn_texasr]"i"(SPRN_TEXASR)
: "memory", "r3"
assert(rv); /* make sure the transaction aborted */
if ((texasr >> 56) != TM_CAUSE_RESCHED) {
if (dscr2 != dscr1) {
printf(" FAIL\n");
} else {
printf(" OK\n");
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